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A013448 as a simple table

na(n)
01
10
20
3-160
41792
5-484224
654495232
7-9441003520
82598020579328
9-756380393635840
10305071008569196544
11-144297159065656885248
1281729693136918543335424
13-55094722790449057575731200

[1,0,0,-160,1792,-484224,54495232,-9441003520,
 2598020579328,-756380393635840,305071008569196544,
 -144297159065656885248,81729693136918543335424,
 -55094722790449057575731200]